I wear my helmet for the shallowest possible reason. I like to wear hats. After I ride up to wherever I'm going, I take my helmet off and put my hat on. I don't classify the riding I do as particularly dangerous - mostly poking around on bike trails around town. I'm not convinced a helmet is necessary in that situation the way it would be if I did any gnarly single track at high speed biking.

That being said, one more bad diagnosis and I'm off on a tour around the US, and I'll wear the helmet on the days I feel like it, and leave it off if I don't. I just won't feel like I'll be in danger of losing much quantity of life, while quality (wind in hair, and possibly Boobs) will become so much more important.

Don't get me wrong, I'm not looking for another really bad diagnosis, but if it happens, all bets are off.